[ubuntu] Ubuntu 12.04 USB installation failing

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http://ubuntuforums.org – Hi! I'm trying to install Ubuntu 12.04 Desktop i368 alongside my Windows 7 OS, by booting from USB. A few seconds after I press "Install on hard drive", the installation gets stuck.I tried 2 differen USB drives, 2 Different USB ports and the BIOS boots first from the USB. What can be the problem? Thank you for your help! (Hardware)